In recent years， with the rise of energy consumption in China， the import volume of oil and gas resources has increased rapidly. The search for alternative energy sources has gradually attracted attention all over the world. Oil shale is an important alternative energy source for petroleum： huge reserves， wide distribution and broad prospects for exploitation. At present， the main mining methods of oil shale include surface dry distillation and underground in-situ conversion. Because surface dry distillation requires large factories， covers a large area， and pollutes the environment， underground in-situ conversion is valued. G-STARS numerical simulation software was used to establish an oil shale underground in-situ mining model for simulation of the oil production dynamics in the process of underground in-situ conversion of oil shale， and for analysis of the influence of different reservoir reconstruction parameters. The results showed that well spacing has an important impact on oil shale production. The larger the well spacing， the better the long-term exploitation effect of oil shale， but the worse the short-term exploitation effect. The higher fracture permeability only increases the cumulative oil production in the early stage， and has little effect on long-term exploitation.